I want to build a simple discrete event simulation similar to the emergency room simulation shown here: http://www.youtube.com/watch?v=Y6kCMBM-sZs
I have a few different types of people (carpenters, painters, and plumbers). Each one has to go follow a sequence of steps (buy the wood, polish it), each of which takes a certain amount of time (thirty minutes plus or minus 5 minutes). And stuff gets 'done' when all three have finished their work.
Is there a free tool that would allow me to simulate this? The visualization is not as important as the discrete event simulation itself.